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Beosat Parabolic Antenna

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satnuker
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satnuker posted on Thu, Nov 7 2019 6:04 PM

Dear friends

I have Beosat Parabolic Antenna-ODU90.

I don't have LNB to this antenna and I don't know the focal

length and the opening angle of the antenna.

Please find the information I need.

 

Best regards Smile


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solderon29
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I think that the ODU90 was a prime focus device ,ie with the focal point and lnb mounting of the dish in the centre?

The later ODU's were Fuba offset focus types,with the lnb mounted on a boom arm below the dish,the same principle as all modern dish antennai.

In either case,the dish was designed for mounting a LNB and Polaroter combination,as it was for the then standard Analogue Satellite tv broadcasting system.

You could use a modern switching type LNB,there are adaptors available.This would then be compatible with modern digital receiver's.

What are you trying to achieve with such a relatively large dish antenna?

The elevation angle setting of the dish will depend upon whereabouts you are in the world,and which satellite you want to receive broadcasts from?

Nick

satnuker
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solderon29    Thanks! 

satnuker
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solderon29
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The original promotional picture of the dish,shows it fitted with an integrated feed,polorotor and lnb.These were made by Chapparel (U.S.A.) for use with the then standard analogue reception systems.

The four fixing holes are apparent in the photo of your dish.

To adapt the dish for current digital reception,you will need a feedhorn that will fit to the support arm,and a modern digital lnb.

Polarity is handled electronically inside the lnb nowaday's.

The fixing for the feed horn will need to allow for Fore/aft adjustment to focus the  reception of the horn.

The support arm remains fixed.

The elevation of the dish is handled by the bracketry behind the dish.

If you tell me the latitude and longtitude of your site,and the satellite that you want to receive  from,I can tell you the angles.

Nick

solderon29
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Further to above post's,I've done some searching here in the U.K.and I've found a specialist satellite tv component supplier.They seem to be able to supply adaptors to update your dish with a kit including lnb for about 60GBP.

However,if you are in North America,I imagine that you could find a similar solution there.

If you mention that you want to adapt a dish that is designed for the Chapparel electro-mechanical feed/polorotor assembly,they will know what you mean,and can come up with a fix?

Nick

satnuker
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Thanks Nick!

Yes I want to use this dish with a modern digital LNB.

I want to try this dish for different satellites, I am just curious. 

The elevation angles will be different, I will be able to do it myself

The original of the dish ODU90-Fuba?Triax? or ........?


solderon29
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You'll need the "u" bolt pole fixing's,and with such a large dish,you will also need to secure the dish well,with a wall bracket or floor stand.You should be able to get these from anyone who can help you with the feed/polarotor/lnb replacement..

Yes indeed,the elevation settings are clearly marked,and you can get all the data for establishing the angles you need,both elevation and azimuth from the internet.Use a local map to work out your site details.

If you get really interested,you can even buy a small motorised mount and positioner,,that will enable you to explore many satellites.

These dishes were originally used with B&O satellite tv receiver's which were integrated with the tv.

They were made by Triax I think.The later smaller dishes were plastic and made by Fuba.All were very good quality as you would expect.

Nick

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